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Dimension of Steam: Gorgeous World of Ashes (絢爛なりし灰燼世界ディメンジョン・オブ・スチーム,Genran'nari shi Kaijin SekaiDimenjon obu Suchīmu?) is the Noble Phantasm of Charles Babbage. The "Difference Engine" and "Analytical Engine" that was designed before in his lifetime; had it been truly completed, the brilliant steam engine he had strived for would have finally arrived in the civilized world. In other words, this Noble Phantasm is the sublimation of Babbage's craving and reverie for his dreamed of future carried in his very heart and the mechanical armor that wraps his body.[1][2]

It is a Reality Marble that allows for the creation of various smaller machines modeled after Caster's armor. A continuously active-type Noble Phantasm. It is designated as a high ranked Noble Phantasm because of its special characteristics and rare nature, but its firepower aspect is only equivalent to the level of a B~C ranked Noble Phantasm. In addition, when its True Name is released, its internal steam engine becomes fully operational and he conducts a ranged attack with high power behind it. He will never release the armor because he is manifesting a special steam engine that is powered by the continually deploying Reality Marble inside the sealed armor. If he releases it even once, the Reality Marble will be eliminated from the world and only a lump of steel that cannot speak will be left behind.[1][2]

Profile
A mathematician turned scientist from the 19th Century.
The King of Steam who dreamed about the revolution of the world.
The prodigious great scholar who employed a steam engine to invent the first computers in the world - the "Difference Engine" and the "Analytical Engine".
In modern times, he came to be called a "father of the computer".

Level 2 Bond
--he died halfway through his intentions.
The Difference Engine was not completed.
The Analytical Engine was not completed.
Leaving behind to the world his dream of the "possible future" that vanished in the threshold of the eras, he died.

Level 3 Bond
And now is the time he has manifested.
Wrapping his body with that possible future, in the form of grotesque steel.
Concealing inside the future he dreamed about, in the form of a grotesque world.
Having manifested as a Heroic Spirit, his very existence is almost the same as his Noble Phantasm-- his Reality Marble.

Level 4 Bond

Mechanical Armor: EX

His body is constantly wrap in a steam engine-made full-body mechanical armor.
At the same time that STR and END are Rank UP, it also bestows a "++" modifier to three parameters by means of a boost function brought about by the grotesque steam engine.

Level 5 Bond
"Dazzlingly and Ashen* World" *Can also mean "completely destroyed"
Rank: A+ Type: Anti-Army
Dimension of Steam.
A Reality Marble that sublimated craving and reverie, his very heart and also the very mechanical armor that wraps his body.

Interlude
His wish for the Holy Grail is "the advent of a world of steam civilization".
However, due having acquired some knowledge about the modern world upon his manifestation, he has started to perceive that this is not too shabby itself.
Depending on the Master, he will probably become a reliable ally.